book Maths Puzzle Numerical Ability

Solve: 3^x * 9^-x =27^x

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book Other Question

If Amy gives 10 of her stamps to Robin, she will have four times as many stamps as Robin. If she gives 20 of her stamps to Robin, she will have three times as many stamps as Robin. How many stamps do they have in all? Suppose you buy one ticket for a dollar out of a lottery of a 1000 tickets. Where the prize is $500. What is your expected value?